TDA8260TW datasheet(8/23 Pages) PHILIPS

Part #	TDA8260TW

Description	Satellite Zero-IF QPSK/8PSK downconverter with PLL synthesizer

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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2004 Sep 03

8

Philips Semiconductors

Product speciﬁcation

Satellite Zero-IF QPSK/8PSK

downconverter with PLL synthesizer

TDA8260TW

PROGRAMMABLE ADDRESSES

The programmable address bits MA1 and MA0 offer the

possibility of having up to four TDA8260TW devices in the

same system. The relationship between the voltage

applied to pin AS and the value of bits MA1 and MA0 is

given in Table 3.

Table 3

I2C-bus address selection

PROGRAMMABLE MAIN DIVIDER RATIO

Program bytes PD1 and PD2 contain the fifteen bits

N14 to N0 that set the main divider ratio. The ratio

N = N14

× 214 + N13 × 213 +...+ N1 × 2 + N0.

OPERATING AND TEST MODES

The mode of operation is set using bits T2, T1 and T0 in

control byte CD1; see Table 4.

Table 4

Mode selection

Note

1. Status at power-on: the tuning voltage output is

released and pin VT is in the high-impedance state.

REFERENCE DIVIDER

Five reference divider ratios allow the adjustment of the

comparison frequency to different values depending on

the compromise that has to be found between step size

and phase noise. The reference divider ratios and the

corresponding comparison frequencies are programmed

using bits R2, R1 and R0; see Table 5.

Table 5

Reference divider ratio

CHARGE PUMP CURRENT

Four values of charge pump current can be chosen using

bits C1 and C0; see Table 6.

Table 6

Charge pump current

VAS

MA1

MA0

0 to 0.1VCC

00

open-circuit

0

1

0.4VCC to 0.6VCC

10

0.9VCC to VCC

11

T2

T1

T0

MODE

XTOUT

0

normal operation

OFF

0

1

POR state = CP sink(1)

fXTAL

010

1/2 × fDIV

0

1

CP sink

fXTAL

1

0

normal operation

fXTAL

101

2

× fref

2

× fref

1

0

CP OFF

fXTAL

1

CP source

fXTAL

R2

R1

R0

DIVIDER RATIO

COMPARISON

FREQUENCY

000

2

2 MHz

001

4

1 MHz

0

1

0

8

500 kHz

0

1

not allowed

1

0

not allowed

1

0

1

16

250 kHz

1

0

not allowed

1

32

125 kHz

C1

C0

TYPICAL CHARGE PUMP

CURRENT ABSOLUTE VALUES

(

µA)

0

420

0

1

900

1

0

1360

1

2320

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